【转帖】cache renderred screen
 

cache renderred screen

cache renderred screen
i am thinking of caching rendered screen, so rendering process is not called again and again when no database changed or view moved/zoomed etc.
now i use gdi screen example device to paint drawing.
is there a way to use gdi bitmap example device to generate bitmap and use this bitmap when onpaint event is occured?
thanks in advance.

ngurov
# 1st september 2003, 11:31 am

moderator join date: mar 2002
posts: 2,994
bitmap is far from ideal for caching if zoom or rotate is performed. we are working on other types of caching to avoid performing full regen on each onpaint().
sergey slezkin

sslezkin
# 2nd september 2003, 01:48 am

founding member join date: jun 2002
location: bulgaria
posts: 377
if you wish to use external rendering library, i would reccommend - their product coin3d is a realization of the standard openinventor toolkit, which is the successor of opengl.
you can traverse the dwg database and build a openinventor tree, which will be cached automatically and rendered at quite good graphics.
you can use it free with full source code for non-commersial applications or for $2000 per year otherwise.
but you will need more time for research then so i just mention it in case someone is interested in it.
regards
chudomir

chudo
# 3rd september 2003, 07:45 am

registered user join date: aug 2003
location: kiev,ukraine
posts: 9

thank you for your replies.
sergey, is there any kind of estimation when the caching functionality might appear?

ngurov
# 3rd september 2003, 10:16 am

moderator join date: mar 2002
posts: 2,994
next release (in a month or so) will contain some caching at least. current implementation may reduce redraw time up to 15-20 times on some files.
but it will be not final implementation - a lot of things are to be optimized/improved.
sergey slezkin

sslezkin

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bitmap is far from ideal for caching if zoom or rotate is performed. we are working on other types of caching to avoid performing full regen on each onpaint().
sergey slezkin
if you wish to use external rendering library, i would reccommend - their product coin3d is a realization of the standard openinventor toolkit, which is the successor of opengl.
you can traverse the dwg database and build a openinventor tree, which will be cached automatically and rendered at quite good graphics.
you can use it free with full source code for non-commersial applications or for $2000 per year otherwise.
but you will need more time for research then so i just mention it in case someone is interested in it.
regards
chudomir

thank you for your replies.
sergey, is there any kind of estimation when the caching functionality might appear?
next release (in a month or so) will contain some caching at least. current implementation may reduce redraw time up to 15-20 times on some files.
but it will be not final implementation - a lot of things are to be optimized/improved.
sergey slezkin